JPS598097Y2 - air conditioner - Google Patents

Description

[Detailed description of the invention] The present invention relates to an air conditioner incorporating a heater for heating as a heat source for heating or as an auxiliary heat source, and in particular provides a protection circuit for an air conditioner in which such heaters are arranged in multiple layers. It is something to do.

An embodiment of the present invention will be described below with reference to the accompanying drawings.

In the figure, 1 is the main body of the air conditioner, with an intake port 2 on the front.
, a discharge port 3 is formed, and a heat exchanger 4 of a refrigeration cycle, a sirotsko fan 5, and this sirotsko fan 5 are installed inside.
Heaters 7, 8, etc. are housed in a blowing chamber 6 located on the blowing side.

The heaters 7 and 8 are composed of finned pipe heaters arranged in parallel inside a frame, and as shown in the figure, an upper heater 7 and a lower heater 8 are stacked and arranged at an angle. .

A protection device fixed to a mounting plate 9 is provided on the leeward side of these heaters 7 and 8, that is, on the upper heater 7 side.

This protection device consists of an overheat protector 10 such as a bimetal thermostat that opens when detecting abnormally high temperatures of the heaters 7 and 8, and a thermal fuse 11 that melts when the temperature exceeds that temperature, for example, when the abnormally high temperature occurs when the fan 5 stops. It is being organized.

Next, the electric circuit shown in FIG. 2 will be explained.

12 is a relay in which a contact 12a is connected in series with the heater 7 to control the upper heater 7; 13 is a relay in which a contact 13a is connected in series with the heater 8 in order to control the lower heater 8; these are connected in parallel. This circuit is connected in series with the overheat protector 10, thermal fuse 11, and main switch 14 to the power supplies E1 and E2.

The relay 12 that controls the upper heater 7 has a contact 12b in addition to the contact 12a, and this contact 12b is connected to the relay 1.
It is connected in series with relay 13 to control 3.

Reference numeral 15 denotes a room temperature thermostat that turns on and off by sensing the room temperature, and is inserted into the series circuit of the relay 13 and the contact 12b.

Therefore, the relay 12 is connected in parallel with the series circuit of the relay 13, contact 12b, and thermostat 15.

Therefore, when the main switch 14 is turned on, since the room temperature thermostat 15 is closed when the room temperature is sufficiently low, the relays 12 and 13 are energized, closing the contacts 12a and 13a and energizing the heaters 7 and 8, respectively. Ru.

When the indoor temperature rises, the room temperature thermostat 15 is opened, and the lower heater 8 is not energized and only the upper heater 7 performs heating.

If the room temperature drops again, the room temperature thermostat 15
is closed, and the lower heater 8 generates heat.

This operation is repeated, but if a failure such as disconnection occurs in the relay 12 for some reason while controlling it in this way, the contact 12b is opened.
Even if the room temperature thermostat 15 is closed, the relay 13 is not energized and only the lower heater 8 is energized.

That is, if only the lower heater 8 is energized, the operation of the protective device 10.11 provided in the upper heater 7 will be extremely slow, which will adversely affect the inside of the main body 1, and furthermore, the protective device 10.1
This is also a factor in the occurrence of fires due to the delay in the operation of step 1.

Therefore, even if an abnormality occurs in the relay 12, the above-mentioned fear is completely eliminated.

Further, even if the room temperature thermostat 15 is connected in series with the upper heater relay 12 in the wiring at the site, the phenomenon that only the lower heater 8 is energized will not occur.

As is clear from the above explanation, the air conditioner of the present invention has a protection device such as an overheat protector and a thermal fuse arranged on the upper side of the heater stacked in multiple stages, and the plurality of protection devices are arranged in series with this protection device. It is characterized by connecting a circuit in which individual relays that control the heaters on the upper stage are connected in parallel, and the contacts that are opened and closed by the relay that controls the heater on the upper stage side are connected in series to the circuits of other relays. Because it is,
When there is an abnormality in the relay for the upper heater near the protection device, the other relays for the lower heater are de-energized, so there is no delay in the operation of the protection device due to energization of the lower heater, resulting in extremely high safety. It is something.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of an air conditioner according to an embodiment of the present invention;
FIG. 2 is a schematic electrical circuit diagram of the device. 7... Upper heater, 8... Lower heater, 10... Overheat protector, 11... Temperature fuse, 12.13... Relay, 12b...
····contact.

Claims (1)

[Scope of utility model registration request] An overheat protector is installed on the upper side of the heater, which is stacked in multiple layers.
A protective device such as a thermal fuse is arranged, and a circuit in which individual relays are connected in parallel to control the heaters in the plurality of stages is connected in series with the protective device, and the relays that control the heaters in the upper stage side are opened and closed. An air conditioner characterized in that the contacts connected in series to the circuits of other relays.